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(No Model.)

* J. M. JONES.

FRICTION CLUTCH.

No. 307,772. Patented Nov. 11, 1884.

WITNESSES NVENTOR .mhn JVJ. James. (2 B his Attorneys, 2

N PETERS. Phuloinhdgmphnr. Wnshmgkon. n C.

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JOHN M. JONES, OF PALMYRA, NEIV YORK.

FRICTION-CLUTCH.

A3.i.'.;3...i?::i fi ,TI:E\ forming part of Letters Patent No. 307,772,dated November 11, 1884. Application filed Apr-i124, 1884. (No model.)

To aZZ whom it may concern:

Be it known that I, J GEN M. J ONEs, of Palmyra, in the county of WVayneand State of New York, have invented certain new and useful Improvementsin Friction-Clutches, of which the following is a specification.

My invention relates to a friction device for clutching a band-pulley toabalance-wheel or shaft, designed more especially for use in connectionwith printing-presses, but capable of use with other machinery.

The invention consists of a hub or wheel formed with a beveled annularrim or flange and secured firmly upon the shaft to be driven, aband-pulley provided with a rim beveled to fit the first, and a leverpivoted to a swivel 011 the shaft, and arranged to press the bandpulleytoward the fixed hub or wheel.

The invention further consists in providing the lever with a roller toreduce the friction between it and the band-pulley, and in an adjustablerack to retain the lever in position, whereby the friction between theband-pulley and the fixed hub or wheel may be regulated, as and for thepurpose hereinafter explained.

In the accompanying drawings, Figure 1 represents a face view of myimproved device applied to a j ob-printing press; Fig. 2, a section onthe line 00 w of Fig. 1,- Fig. 3, an enlarged view of the same withlever reversed.

This invention is designed to take the place of the fast and loosepulleys commonly employed for applying power to printing-presses andother machinery, the objects being to economize space, reduce the costof construction facilitate the starting and stopping, and permit avariation in the speed of the machinery without varying that of theprime motor. -With this end in view, I construct the clutching device inthe manner indicated in the accompanying drawings, in which- Arepresents a printing-press, the driving shaft 1-3 of which is furnishedwith a fly-wheel, G, secured firmly thereon, said wheel being formed orprovided with an annular flange, a, beveled on its inner face, as shownin Fig. 2. By the side of the balance-wheel is placed a band or beltpulley, D, which is free both to slide and turn on the shaft B, exceptwhen forced and held in its working position, as presently explained.

The band-pulley is formed with a beveled rim, Z), made to accurately fitwithin the rim to of the fly-wheel, and is also formed with a centralhub or boss, 0.

Upon the shaft Bismountedaswivcl-bl0ck, E, to which is pivoted orjointed a lever, F, carrying a roller, d, which is arranged to bearagainst the face or end of hub 0, so that by moving the lever, andthereby causing the roller to press with greater orless force againstthe hub c, the band-pulley will be pressed toward the flywheel, and itsbeveled rim caused to press correspondingly against the rim of saidfly-wheel, thereby locking the two together and causing them to move inunison.

A rack, G, provided with notches, is arranged in suitable position toreceive the free end of the lever F, to hold the same at its dif ferentadjustments.

In practice I have found that by varying the pressure of the lever agreater or less amount of slip may be caused between the rims a b, andthat the speed of the machinery can be thereby regulated and controlled.In order that this variation of pressure may be readily effected, Imount the rack G upon an arm or bracket, H, arranging it to slidethereon, and I provide a screw, I, by which the rack may be moved in orout, as indicated in Figs. 2 and 3. It will be readily seen that underthe different adjustments of the block the lever will require to bemoved inward different distances, consequently varying the pressure uponthe hub of the pulley.

In order that the swivel-block E may be applied readily at any pointupon a shaft, it is preferably formed, as shown in Fig. 3, in the shapeof a yoke,to straddle the shaft, and provided with a block, 6, held inposition by a bolt or pin to close the open side or end of said yoke.The shaft may be grooved to prevent end play of the block; or collars,either permanent or adjustable, may be arranged upon the shaft at eachside of the block. It is not essential that the rims have their edgesbeveled,thongh such construction is preferred.

I am aware that friction-clutches have heretofore been made in a greatvariety of forms; but I am not aware that any one has hitherto mountedthe block to which the lever is piv oted directly upon the shaft, orthat it has ever been proposed to vary and regulate the speed of thedriven machinery by varying the degree of friction between thefriction-surfaces. I By thus mounting the swivel-block upon the shaft Iam enabled in' all cases to easily and readily apply the lever, whereasunder other constructions the pivot has required a special support onthe frame of the machine or elsewhere, which iii many cases isinconvenient or impracticable. I am also enabled to obtain greatleverage, which cannot be done in all cases under former constructions.

By the use of the roller d, I am enabled to produce any requisite degreeof friction between the fixed hub or wheel and the loose pulley withoutproducing any considerable degree of friction between the lever and thepulley.

Having thus described my invention, what I claim is 1. Theherein-described clutching device, consisting of a hub or wheel rigidlysecured upon a shaft, a pulley free to slide and rotate upon said shaft,and a lever pivoted to aswivel-block mounted on the shaft, and arrangedto bear against the pulley and to hold it in contact with the fixed hub.

2. In combination with the fixed hub and the sliding pulley, a leverprovided with a roller arranged to bear against the pulley and to forcesaid pulley against the fixed hub or wheel, substantially as described.

3. The herein-described clutching device, consisting of shaft 13,carrying fly-wheel C, the latter provided with a rim, a, pulley D,having rim 1), and lever F, pivoted to swivelblock E, and arranged tobear against pulley D, substantially as and for the purpose set forth.

4. In combination with a friction-clutch substantiallysuch as described,provided with 40 an operating-lever, an adjustable rack to retain thelever inits different adjusted positions, substantially as explained.

5. In combination with the operating-lever of a friction-clutch, thesliding-rack G and 5 adjusting-screw I.

JOHN M. JONES.

NVitnesses:

M. HOPKINS, G. M. NIcHoLs.

